POWER INTEGRATIONS INC — Director's Dealing 2011

Mar 23, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: POWER INTEGRATIONS INC (POWI)
CIK: 0000833640
Period of Report: 2011-03-21

Reporting Person: BALAKRISHNAN BALU (President and CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-03-21	Common Stock	M	4000	$17.75	Acquired	250152	Indirect
2011-03-21	Common Stock	S	4000	$37.5088	Disposed	246152	Indirect

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-03-21	Non-Qualified Stock Option (right to buy)	$17.75	M	4000	Disposed	2013-01-08	Common Stock (4000)	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	25000	Direct

Footnotes

F1: The range of prices for the enclosed transactions were $37.39 to $37.62.

Upon request by the SEC staff, the issuer, or any security holder of the issuer we will provide full information regarding the number of shares sold at each separate price.

F2: This sale is pursuant to a 10B5-1 Sales Plan